<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Promise关键问题 - 中断 Promise 链条</title>
</head>
<body>
    <script>
        let p = new Promise((resolve, reject) => {
                resolve('OK');
        });
        var pendingPromise  = null ;


        setTimeout(() => {
            console.log('setTimeout') ;
            
            console.log(pendingPromise, ret, ret===pendingPromise) ;
        })

        var ret = p.then(value => {
            console.log(111);
            //有且只有一个方式
            pendingPromise = new Promise(() => {});
            return pendingPromise ;
        });
        
        console.log(ret) ;


    </script>
</body>
</html>